OK, so maybe not yet, but moritz blogged about sprixel, "a new Perl 6 compiler in its early stage of development, written in JavaScript and using the standard Perl 6 grammar STD.pm."

To quote from moritz's blog:

Sprixel (an anagram of perlsix) development was initiated by Matthew Wilson, aka diakopter. It traverses the Abstract Syntax Tree as produced by STD.pm, transforms it into an intermediate JavaScript data structure similar to JSON (but with some enhancements to handle cyclic structures), and has a small, continuation based runloop that executes the JavaScript. Currently the only backend is the V8 compiler and virtual machine - but if/when the STD grammar is implemented, you'll be able to run Perl 6 in your browser.

Great work! The future looks brighter already.